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1
Content available remote Suitability of DIC and ESPI optical methods for monitoring fatigue damage development in X10CrMoVNb9-1 power engineering steel
Kopec M., Brodecki A., Kukla D., Kowalewski Z. L.
Archives of Civil and Mechanical Engineering
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2021
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Vol. 21, no. 4
542--554
EN
The aim of this research was to compare the effectiveness of two different optical measurement techniques (digital image correlation-DIC and electronic speckle pattern interferometry-ESPI) during fatigue damage development monitoring in X10CrMoVNb9-1 (P91) power engineering steel for pipes. The specimens machined from the as-received pipe were subjected to fatigue loadings and monitored simultaneously using DIC and ESPI techniques. It was found that DIC technique, although characterised by lower resolution, was more effective than ESPI. DIC allows to monitor the fatigue behaviour of steel specimens and accurately indicate the area of potential failure even within the initial stage of fatigue damage development.
2
Content available Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites
Ranachowski Z., Ranachowski P., Brodecki A., Kopeć M., Kudela S. jr.
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 2
893--899
EN
Two types of composites, consisting of pure magnesium matrix reinforced with two commercially used carbon fibers, were systematically studied in this paper. The composites fabricated by the pressure infiltration method, were subjected to quasistatic and dynamic compression tests. Morphology of fiber strands was observed using scanning electron microscope (SEM). The application of carbon fibre reinforcement led to the stiffening of tested materials, resulting in the limitation of the possible compression to approx. 2.5%. The performed tests revealed the remarkable difference in compression strength of investigated compositions. The cause of that effect was that GRANOC fiber reinforced composite exhibited insufficient bond quality between the brittle fibers and the ductile matrix. T300 reinforced composite presented good connection between reinforcement and matrix resulting in increased mechanical properties. Investigated composites demonstrated higher mechanical strength during deformation at high strain rates. Microscopic observations also proved that the latter fibers with regular shape and dense packaging within the filaments are proper reinforcement when designing the lightweight composite material.
3
Content available Ocena trwałości zmęczeniowej końcówki drążka kierowniczego
Szymczak T., Brodecki A., Kowalewski Z., Lasota P.
Transport Samochodowy
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2018
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z. 2
63--72
PL
W pracy zaprezentowano wyniki badań trwałościowych końcówki drążka kierowniczego pojazdu o dmc powyżej 3.5 tony. W badaniach wykorzystywano wielkogabarytową platformę wibroizolowaną, serwohydrauliczny siłownik mobilny oraz cyfrowy kontroler sygnałów IST Instron. Próby prowadzono w warunkach działania obciążenia zmiennego cyklicznie do uzyskania 2×106 cykli. Ze względu na kompleksową ocenę zachowania końcówki drążka kierowniczego testy przerywano, by wykonywać oględziny obiektu badań. Wyznaczono zmiany kąta wychylenia oraz momentu siły w funkcji liczby cykli oraz przedstawiono ich prognozę. Omówiono procedurę badawczą służącą ocenie trwałości przegubu kulistego.
EN
The paper reports results from test of steering rod tip used in car having permissible total mass above 3.5 t. Anti-vibration platform, servo-hydraulic actuator and digital controller IST Instron were used to execute the tests. The experiments were carried out under cyclic loading up to 2×106 cycles. The tests were interrupted for inspecting the examined object. Variations of angle and force moment and prediction of their values versus number of cycles are presented. Details of experimental procedure for evaluation of steering rod tip are provided.
4
Content available Damage development of Inconel 718 due to laboratory simulated creep
Makowska K., Brodecki A., Mackiewicz S., Kowalewski Z. L.
Journal of Theoretical and Applied Mechanics
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2018
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Vol. 56 nr 3
893—896
EN
The paper presents an attempt of application of the acoustic birefringence coefficient for early stage degradation assessment of Inconel 718 nickel superalloy after short-term creep. It is shown that it can serve as a good damage sensitive parameter and, moreover, it can be well correlated with hardness variation.
5
Content available Influence of Anisotropy on the Viscoplastic Properties of a Hot Rolled Ti6Al4V Titanium Alloy
Moćko W., Kostrzewski C., Brodecki A.
Archives of Metallurgy and Materials
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2018
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Vol. 63, iss. 1
403--411
EN
In this work, the influence of strain rate on the anisotropy of the Ti6Al4V titanium alloy has been analyzed. Tensile tests of notched specimens were carried out in three loading orientations (0°, 45°, and 90°) with respect to the rolling direction, using the servo-hydraulic testing machine and Hopkinson bar. Investigation was supported by the digital image correlation analysis of strain distribution on the specimen surface and assessment of the fracture mechanism. The Ti6Al4V titanium alloy reveals a typical strain rate hardening behavior; however, strain rate sensitivity is independent of the loading orientation. Increases of the loading orientation results in material softening, observed as lowered yield stress, whereas plastic strain exponent and modulus remain unaffected. Fracture strain decreases with loading orientation at quasi-static and dynamic loading conditions.
6
Content available Digital image correlation technique as a tool for kinematics assessment of structural components
Brodecki A., Szymczak T., Kowalewski Z.
Acta Mechanica et Automatica
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2018
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Vol. 12, no. 2
101--104
EN
The paper reports the results of tests carried out for kinematic properties determination of components under cyclic loading. DIC system called 5M PONTOS was employed to follow variations of displacement versus time. It was conducted by the use of markers stuck on selected sections of components tested. The results are presented in 2D and 3D coordinate systems expressing behaviour of such elements as: mechanical coupling device, boat frame and car engine. These data enabled to capture weak and strong sections of the component examined at various loading conditions.
7
Metoda cyfrowej korelacji obrazu w badaniach materiałów i elementów konstrukcyjnych
Szymczak T., Kowalewski Z. L., Brodecki A.
Dozór Techniczny
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2016
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z. 4
22--31
PL
W pracy omówiono technikę cyfrowej korelacji obrazu (DIC) przeznaczoną do bezkontaktowego określania rozkładów składowych przemieszczenia i na ich podstawie obliczania składowych odkształcenia oraz naprężenia. Umożliwia ona również wyznaczanie parametrów kinematycznych obiektów inżynierskich w postaci prędkości i przyspieszenia, które określane są metodą różniczkowania po czasie zarejestrowanych wartości składowych przemieszczenia. Zaprezentowano polowe zmiany rozkładów odkształcenia wzdłużnego, oraz rozkładów składowych głównych odkształcenia podczas rozciągania stali konstrukcyjnej, które monitorowano aż do chwili zniszczenia materiału. Przedstawiono wyniki próby porównawczej, w której jednocześnie stosowano ekstensometr oraz system DIC. Dodatkowo zaprezentowano rezultaty prób stanowiskowych mechanicznego elementu sprzęgającego przeprowadzonych przy użyciu systemu pomiarów cyfrowych w warunkach oddziaływania cyklicznie zmiennego obciążenia.
EN
Digital Image Correlation (DIC) technique recommended for contactless determination of displacement components distribution is presented. The displacement components were subsequently used for calculations of the strain and stress distributions. The method also enables determination of such kinematic parameters of loaded engineering objects as velocity and acceleration, that can be obtained by displacement components derivation with respect to time. Variations of full-field strain distributions (longitudinal and major strains) during monotonic tension of structural steel monitored up to the fracture of the material are illustrated. The results of comparative test performed by simultaneously application of extensometer and DIC system are provided. Additionally, the results of bench tests of mechanical coupling component carried out using digital measurement device under cyclic loading are presented.
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